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    Wyświetlanie 1-4 z 4
    Tytuł:
    Application of sodium dodecyl glycinate to the flotation of deslimed molybdenum tailings
    Autorzy:
    Bai, Yang
    Li, Caixia
    Song, Wangfang
    An, Hongyun
    Zhao, Jingyu
    Powiązania:
    https://bibliotekanauki.pl/articles/109790.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sodium dodecyl glycinate
    molybdenum tailings
    molecular simulation
    nonmetallic minerals
    amino acid collector
    Opis:
    By researching the nonmetallic minerals in molybdenum tailings, this paper investigated the possible application of sodium dodecyl glycinate (SD) to deslimed tailings as an alternative to the large dosage and complex flotation reagent systems of conventional combination collectors (dodecylamine and sodium oleate). The floatability differences of nonmetallic minerals under different SD dosages were analyzed via pure mineral flotation experiments, and the adsorption behavior of SD onto different mineral surfaces was analyzed by quantum chemical calculations. The results of the calculated adsorption structures and energies of the different mineral surfaces show that SD was chemically adsorbed onto the albite (001), phlogopite (010), diopside (110), dolomite (101), calcite (104) and calcite (101) surfaces and that physical adsorption occurred at the phlogopite (001) surface. The corresponding adsorption trend was dolomite > calcite > diopside > albite > phlogopite. These results theoretically verify the feasibility of applying SD to the flotation of nonmetallic minerals in tailings and provide a basis for the selection of inhibitors needed for separating phlogopite from other minerals. In the flotation of deslimed molybdenum tailings, the recoveries of the nonmetallic minerals achieved with SD were close to those in pure mineral flotation, which was greater than the recoveries achieved with dodecylamine and sodium oleate (NaOl), and the dosage was reduced by approximately 25%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1120-1131
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the mechanism for improving green pellet performance with compound binders
    Autorzy:
    Li, Caixia
    Bai, Yang
    Ren, Ruichen
    Liu, Gaoquan
    Zhao, Jingyu
    Powiązania:
    https://bibliotekanauki.pl/articles/110562.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pelletization
    Mg-bentonite
    expanded starch
    CMC
    house-of-cards structure
    Opis:
    In this study, the characters of bentonite organic binders were investigated by analytical methods, including X-ray diffraction, zeta potential, and scanning electron microscope. The results showed that the surfaces and the edges of montmorillonite layers reacted with carboxyl groups or oxhydryl groups of expanded starch or carboxymethyl cellulose (CMC), enhancing the surface electronegativity of the bentonite. The addition of organic binders reduced the contact angle between the bentonite and magnetite and enhanced the hydrophilicity of bentonite surfaces. Based on the polymer chains of organic binders, the house-of-cards structure formed by a compound binder was more stable than when formed by bentonite alone. The non-stripped layers in bentonite were peeled off under the action of chemical bonds. At the same time, improved bentonite dispersion in pellets was observed, with decreased bentonite particle size and increased surface area. The solid bridges produced by the reaction between magnetite and Mg2+ in the montmorillonite layer restrained pellet expansion, which thus improved the decrepitation temperature during the heating process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 153-162
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synergistic mechanism of dodecylamine/octanol mixtures enhancing lepidolite flotation from the self-aggregation behaviors at the air/liquid interface
    Autorzy:
    Bai, Yang
    Xu, Mengxu
    Wen, Weixiang
    Zhu, Shifei
    Mo, Weichen
    Yan, Pingke
    Powiązania:
    https://bibliotekanauki.pl/articles/27323641.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    DDA/OCT mixtures
    self-aggregation behaviors
    flotation foam
    molecular dynamics simulations
    surface tension
    air interface
    liquid interface
    Opis:
    Surface tension measurements and molecular dynamics (MD) simulations were used to explore the flotation foam properties and self-aggregation behaviors of dodecylamine (DDA)/octanol (OCT) mixtures formed with different mole ratios at the air/liquid interface. Based on the surface and thermodynamic parameters, the DDA/OCT mixtures exhibited greater interfacial activities and adsorption capacities than their individual components. The MD simulations showed that DDA and OCT were aggregated through hydrogen bonding, coulombic forces and hydrophobic association. OCT was inserted into the DDA adsorption layer, causing the alkyl chains of both DDA and OCT to extend from water to air at varying heights and angles. The addition of OCT improved the hydration of the amino groups and reduced the overall number of hydrogen bonds. The stability of the flotation foam decreased, and the high viscosity and difficult defoaming of the DDA flotation foam were significantly improved. When the DDA/OCT mole ratio was 2:1, the included angle formed between the alkyl chains and the interface was maximized, leading to enhanced compatibility among the alkyl chains, and the hydrogen bond energy was relatively large, which showed a strong synergistic effect. The MD simulation findings were consistent with the results obtained from the lepidolite flotation and surface tension experiments conducted in this study; our results could provide a theoretical foundation for the selection of superior mixed collectors and frothers.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176510
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation and molecular dynamics simulation of muscovite with mixed anionic/cationic collectors
    Autorzy:
    Bai, Yang
    Li, Caixia
    An, Hongyun
    Wang, Guoliang
    Zhao, Xin
    Zhang, Jinqi
    Powiązania:
    https://bibliotekanauki.pl/articles/110125.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    muscovite
    mixed anionic/cationic collectors
    flotation
    molecular dynamics simulation
    Opis:
    In this study, three kinds of anionic collectors (sodium oleate (NaOl), sodium dodecyl sulfonate (SDS) and naphthenic acid (NA)) were used in combination with dodecylamine (DDA) to investigate the flotation behavior of muscovite under the action of different mixed anionic/cationic collectors, and their mechanisms for adsorption on the muscovite (001) Surface were clarified using molecular dynamics simulations. The flotation results indicated that different mixed anionic/cationic collectors could improve the recovery of muscovite to varying degrees, but the optimum molar ratio of anionic collectors to DDA and the optimum mixed collector dosage were different. Molecular dynamics simulations showed that the mixed anionic/cationic collectors could significantly increase the hydrophobicity of the muscovite, as evidenced by the decrease in the calculated water molecule density on the muscovite surface and the diffusion coefficient of water molecules at the solid/liquid interface. The interaction between the amino group and the polar group of anionic collectors reduced the electrostatic repulsion between DDA cations and theoretically increased the adsorption capacity of the mixed anionic/cationic collectors on the muscovite surface. Moreover, DDA/NA and DDA/NaOl could improve the calculated carbon atom density on the muscovite surface, which enhanced the hydrophobic association between nonpolar carbon chains, thus further achieving an enhanced flotation performance.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 2; 313-324
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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